Man arrested in Maryland mass shooting plot refers to himself as 'a joker'

(AP) - Police in Maryland have arrested a suspect who investigators say referred to himself as "a joker" and was plotting to stage a shooting in his workplace.

An official with knowledge of the investigation told The Associated Press Friday that Neil Prescott of Crofton, Md., earlier this week phoned in a threat to software and mailroom supplier Pitney Bowes that he was going to "shoot the place up." Investigators say a search of Prescott's home turned up more than 20 guns, including assault rifles and handguns, and more than 400 rounds of ammunition.

The official spoke on condition of anonymity because the investigation is unfolding.

The official says though the suspect referred to himself as "a joker," there is no other known connection to a deadly shooting last week at a Colorado movie theater during the latest Batman movie.